Introduction
The assembly 3500/25 128075-01 is a Keyphasor® Module and its associated Input Conditioning Card for the Bently Nevada 3500 Machinery Protection System. This assembly is a critical system component responsible for providing a once-per-revolution timing reference for a machine's shaft. The 3500/25 module chassis houses the logic and communication interfaces, while the 128075-01 card conditions the raw signal from a Keyphasor transducer (typically a proximity probe or magnetic pickup). It generates a sharp, clean pulse that is used for phase reference in vibration analysis, speed measurement, and synchronizing data acquisition during machine startups and shutdowns.
Parameters / Specifications
The following table outlines the key technical parameters for this Keyphasor assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/25 (Module) & 128075-01 (Input Card) |
| Description | Keyphasor® Module Assembly |
| Module: 3500/25 | |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (Standard 3500 Series frame slot) |
| Weight (Module) | Approx. 0.45 kg (1.0 lb) |
| Primary Function | Keyphasor Signal Processor and System Interface |
| Input Channels | 2 independent Keyphasor input channels |
| Power Supply | Powered by the 3500 rack. |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Input Card: 128075-01 | |
| Description | Keyphasor Input Conditioning Card |
| Physical Dimensions | A plug-in card designed for the 3500/25 chassis. |
| Weight (Card) | Approx. 0.15 kg (0.33 lb) |
| Compatible Inputs | Proximity probes, magnetic pickups, photoelectric sensors |
| Input Voltage Range | Typically -1 V to -20 V DC from an eddy current probe system |
| Output Signal | A clean, digital pulse once per revolution for each channel |
| Total Assembly Weight | Approx. 0.6 kg (1.32 lb) |
*Note: The specific input type and signal thresholds are configured within the 3500 system software. The 128075-01 card provides the necessary signal conditioning, filtering, and shaping for the connected transducer.*
Application Scenarios
This Keyphasor assembly is essential for any application requiring phase-related vibration data or precise speed tracking.
Vibration Phase Reference for Balancing:
Provides the phase reference necessary for determining the phase angle of vibration vectors, which is absolutely critical for field balancing of rotors to correct imbalance.
Startup and Shutdown (Coast-Down) Analysis:
Enables the 3500 system to collect and plot vibration amplitude and phase data as a function of rotor speed during machine transients. This is crucial for diagnosing resonance and other speed-dependent phenomena.
Speed Measurement and Overspeed Protection:
Provides a reliable and accurate speed signal derived from the Keyphasor pulse rate. This signal is used by the monitoring system for overspeed detection and protection.
Torsional Vibration and Order Tracking:
The precise timing pulse allows vibration analysts to filter data to synchronous (1X) or other harmonic components, a fundamental technique for diagnosing faults like misalignment and shaft cracks.
Multi-Shaft Machine Trains:
With two independent channels, a single module can provide Keyphasor references for two different shafts on a complex machine train, simplifying the system architecture and ensuring synchronized data collection.
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